Roof scraping machine



J. KATZ ROOF SCRAPING MACHINE Aug. 15, 1950 v 2 Sheets-Sheet l N WN m Nb m m Nb Filed Dec. 6, 1947 INVENTOR J. KATZ v ROOF SCRAPING MACHINE Filed Dec. 6, 1947 2 Sheets-Sheet 2 11. 83 8062 INVENTOR Joseph Kiwi} sists of a collar 24 bearing against one side of standard 2| and having a cylindrical extension 25 passing through slot 22. A collar nut 26 threadedly engages the threaded end of cylindrical extension 25 and with collar '24 forms a clamp for securing the bearing member 23 in any desired vertical position within slot 22. In other words by loosening collar nut 26 the bearing member may be moved up or down within slot 22 and then secured in desired position by tightening collar nut 26.

Mounted for free rotation on a horizontal axis within bearing member 23 is a guide 21. This guide comprises a cylindrical bore 28 which desirably is lubricated by a grease cup 29, and a cylindrical extension 30 rotatably mounted for free rotation on a horizontal axis within bearing member 23. End of cylindrical extension 36 protruding beyond bearing member 23 is threaded and is provided with a nut 3| and lock nut 32 to secure it within this hearing member. A grease cup 33 communicates with a grease channel 34 which provides lubricant for lubricating the contacting surfaces between guide 21 including the cylindrical extension 36 and the bearing member 23. V

- Mounted for sliding movement within the guides 21 on opposite sides of the machine, as shown in Figures 1 and 2, is a pair of rods or bars 35, 36. A scraper 3-1 is fastened to one end of these rods desirably the scraper may be removably secured to the center of a cross bar 38 bolted or otherwise fastened to one end of rods 35,:36'. Any desired implement or tool, such as a brush, may replace the scraper so that after the, gravel surfacing is scraped the machine may be used to sweep the resultant roof to provide a clean surface for re-roofing, etc. vThe other ends of. rods 35, 36 are suitably fastened to a pair of cranks 39, 46; this connection desirably is lubricated by a grease cup 40" of any well known type. These cranks are keyedto a driven shaft 4| whichis .rotatably'mounted in suitable bearings 42 carried 'bybrackets 43' bolted or otherwise secured to platform I I. v

The machine may be actuated and driven in any' desired manner. One preferred constructlon, shown in Figures 1 and 2, involves an electrlc motor 44 bolted as at 45 to platform I This motor is supplied-with current through a fuse box 46 which has a line 41 providedwitha switch 48 mounted on handle: l3 for controlling energization and 'deenergization of motor 44. A second line 49 leads to any suitable current source.

Armature shaft 50 of motor 44 has keyed thereto a pulley 5| which through belt 52 drives pulley 53 keyed to shaft 4|. A- pulley 54 keyed thereon a second pulley which through belt 6| and pulley 62 drives a, shaft 63 on which is loosely mounted a wheel 64, desirably a rubber tired traction wheel. Shaft 63 is mounted for rotation in the lower end of a pair of supports 65, 66 (Figure 2), the upper ends of which are pivotally mounted on stub shaft 51. Thus when the operator bears down on handles l8 and IS, the pivotal mounting of supports 65, 66 for driven wheel 64 permits this wheel to move downwardly while the front end M of the carriage and the scraper 31 are raised about intermediate wheels l5 as a pivot. This permits raising of the scraper 3? to clear any obstructions and enables the machine to be manipulated with greater ease.

' F Traction wheel 64 is placed in driving engagement with driven shaft 63 through a clutch 61 shown diagrammatically and which may be of any well known type. Linkage mechanism 68 pivoted at 69 to handle H! is provided for actuating the clutch so that the operator'by actuating hand lever 10 of this linkage mechanism may, as well known in the clutch art, actuate the clutch -61 to place wheel 64 in or out of driving engagement with driven shaft 63. Since the clutch 51 and the linkage mechanism 68 for operating same may be of any well known type it is believed no useful purpose would be served by describing same in greater detail.

In the operation of the modification of Figures 1, 2 and 3, the operator engages handles |8, |9

and positions the machine to scrape the desired surface, the position of bearing members 23 in slots 22 on standards 26 and 2| having previously been adjusted to dispose rods 35 and 36 at the desired angle of inclination taking into account the pitch of the roof; the thickness of gravel thereon and the desired depth of penetration of scraper 31 into this gravel layer. Switch 48 is then closed energizing motor 44 which through armature shaft 50, pulley 5|, belt 52 and pulley 53 drives shaft 4| thus rotating cranks 39 and 4i3:and moving rods 35, 36 through lubricated bores '28 in the guides 21. The rods thus move the scraper in an elliptical path into and out of the surfacing layer. Since these guides 21 are freely -rotatable on a horizontal axis, namely, cylindrical extensions 36 are freely rotatable in the cylindrical bores in bearing members 23, the guides automatically accommodate themselves to the different angles of inclination to which the rods 33 and 35 may be adjusted and this without excessive friction between the rods and bores in the guides in which the rods slide.

As long as the clutch 61 is not actuated to place the driving shaft 63 in driving engagement with traction wheel 64 the machine stands still, the scraper being projected into and withdrawn from the gravel. This feature of the machine is important when working on roofs having compacted portions which require several strokes of the scraper to loosen the same. When the surface has been loosened to the desired extent, the operator actuates the clutch 61 so that wheel 64 is driven throughpulley 54 on shaft 4|, belt 55,-pulleys 56 and.6|l, belt 6|, pulley 62, shaft 63 and clutch 61 moving the carriage ID. The carriage moves forward under the control of the operator-,the scraper'moving back-and forth to shaft 4| through belt 55 drives a pulley- 56 keyed to stub shaft 51 rotatably" mounted in bearings 58 carried by standards '53 bolted or otherwise suitably secured near the rear end I? of thecarriage l5; Stub shaft- 51 has keyed into and out of the gravel layer and the loosscraper 31 is still in contact with the gravel surfacing. In this way the depth of penetration of the scraper 31 into the surfacing layer may be controlled during movement of the machine, so that by tilting platform II more or less different thicknesses of surfacing may be removed as the machine progresses over the gravel surfacing.

When it is desired to treat a roof or a substantial portion thereof of different pitch or having a different thickness of surfacing, the angle of inclination of the rods 35, 36 may be changed by loosening nuts 25, properly positioning the bearing member 23 and again tightening these nuts. The adjustable. bearing members 23 and the tiltable mounting for the scraper combine to make the machine extremely flexible and efficient in effecting the removal of gravel surfacing from roofs varying in pitch or having diiferent thicknesses of surfacing.

In the modifications of Figures 4 and 5 parts like those hereinabove described in Figures 1, 2 and 3 have been given like reference characters. In Figure 4 instead of a single scraper 31 each of the rods 35, 36 is provided with a scraper H individual thereto, so that the machine in operation simultaneously removes two parallel bands of surfacing material.

In the modification of Figure 5 only one supporting rod 12 disposed on the longitudinal median of the machine is employed, instead of the pair of rods 35 and 36 disposed on opposite sides of the machine as in the other modifications. Rod 12 is slidably movable in a guide 13 which has cylindrical extending portions M, 15 on opposite sides thereof rotatably mounted in adjustable bearing members 16, 11, each corresponding to bearing member 23 hereinabove described in detail. End 18 of rod 12 is suitably fastened to a crank 19 keyed to shaft 80 rotatable in bearing 8|. A pulley 82 on shaft 8!! is driven by a belt 83 passing over a pulley 5| on armature shaft 50 of motor 44.

The operation of the modifications of Figures 4 and 5 will be evident from the above description thereof taken with the description of the operation of the modifications of Figures 1 and 2.

It will be noted the machine embodying the invention is readily adjustable to accommodate roofs of different pitches and roofs having different thicknesses of gravel surfacing, is simple in design and eflicient in operation.

Since different embodiments of the invention could be made without departing from the scope of this invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

What is claimed is:

1. In a roof scraping machine, a carriage, a pair of idler wheels at the front end of said carriage, a second pair of idler wheels at the sides of said carriage between the rear end and the transverse median of said carriage, a driven wheel disposed at the rear end of said carriage, pivoted bracket means on said carriage, said driven wheel being mounted for rotation in said pivoted bracket means, said driven wheel permitting movement of said carriage about said second pair of wheels as a pivot to raise the front end of said carriage, a. pair of standards on the 7 bracket means,

opposite sides of said carriage, an adjustable bearing mounted in each of said standards so that it can be fastened thereto in any one of a number of positions at diiferent heights from the fioor of said carriage, a guide mounted for free rotation on a horizontal axis in each of said bearings, a rod movable in each of said guides, a single scraper fastened to one end of both of said rods, a motor, a shaft driven by said motor, and a pair of cranks on said shaft, said cranks imparting motion to the other end of said rods to effect movement thereof within the guides.

2. In a roof scraping machine, a carriage, a pair of idler wheels at the front end of said carriage, a second pair of idler wheels at the sides of said carriage between the rear end and the transverse median of said carriage, a driven wheel disposed at the rear end of said carriage, pivoted bracket means on said carriage, said driven wheel being mounted for rotation in said pivoted bracket means, said driven wheel permitting movement of said carriage about; said second pair of wheels as a, pivot to raise the front end thereof, a pair of standards on the opposite sides of said carriage, an adjustable bearing mounted in each of said standards so that it can be fastened thereto in any one of a number of positions at different heights from the floor of said carriage, a guide mounted for free rotation on a horizontal axis in each of said bearings, a rod movable in each of said guides, a scraper secured to one end of each of said rods, a motor, a shaft driven by said motor, and a pair of cranks secured to said shaft, said cranks imparting motion to the other end of said rods to effect movement thereof within the guides.

3. In a surface treating machine, a carriage, a pair of idler wheels at the front end of said carriage, a second pair of idler wheels at the sides of said carriage between the rear end and the transverse median of said carriage, a driven wheel disposed at the rear end of said carriage, pivoted bracket means on said carriage, said driven wheel being mounted for rotation in said pivoted said driven wheel permitting movement of said carriage about said second pair of wheels as a pivot to raise the front end of said carriage, a standard on said carriage, an adjustable bearing mounted in said standard so that it can be fastened thereto in any one of a number of positions at difierent heights from the floor of said carriage, a guide mounted for free rotation on a horizontal axis in said adjustable bearing, a rod movable in said guide, an implement fastened to one end of said rod, a motor, a shaft driven by said motor, and a crank on said shaft, said crank imparting motion to the other end of said rod to effect movement thereof within said guide.

JOSEPH KATZ.

REFERENCES CITED The following references are of record in the file of this patent? UNITED STATES PATENTS Number Name Date 389,449 Derbec Sept. 11, 1888 2,245,544 Miller June 10, 1941 

